body{
    margin: 0;
    padding: 0;
}
#bigbox{
    width: 500px;
    height: 800px;
    margin: 20px auto;
}
.box li{
    list-style-type: none;
    float: left;
}
.box li span{
    display: inline-block;
    width: 100px;
    text-align: right;
}
.box li input{
    margin-top: 15px;
}
.qr{
    width: 100px;
    height: 50px;
    font-size: 25px;
    text-align: center;
    font-family:"楷体";
}